noun / verb
cobweb
KAHB-web/ˈkɑːbweb/
A fine, tangled spider web, often dusty.
A dusty cobweb stretches across the corner of the window.

Etymology
The “head” element survives from an old name for a spider, literally “poison-head.” Combined with web, it gives the straightforward meaning “spider's web,” now often used for a dusty indoor one.
In context
there's dust on the spider web, it's no longer sticky to attract bugs. And so, the spider will abandon that spider web and it now becomes a cobweb.
More examples
- She brushes a cobweb off the porch light.
- Cobwebs hang between the rafters in the old shed.
- The unused doorway is cobwebbed from top to bottom.
Forms
cobweb · cobwebs · cobwebbed · cobwebbing
Similar words
- web
- Can name any network, not just a dusty spider web.
- spiderweb
- Specifies a spider's web without suggesting dust or neglect.